Wii is overwhelming aching knee

Parents locked in feverish competitions with their children on the Nintendo Wii are throwing out their backs, spraining their ankles and twisting their knees in increasing numbers, doctors say.

"You have all these nonconditioned folks who don't do anything active and then they suddenly pick this thing up and start doing it," said Dr. Brian Halpern, a sports medicine doctor at Hospital for Special Surgery who has treated people with Wii-induced injuries.

The injuries have become so common worldwide that health experts have even come up with a name for them: Wii knee.

And there are concerns that ailments from the wildly popular Wii will spike after the holidays.